AU1689392A - Digital position system for automatic transmissions - Google Patents

Digital position system for automatic transmissions

Info

Publication number
AU1689392A
AU1689392A AU16893/92A AU1689392A AU1689392A AU 1689392 A AU1689392 A AU 1689392A AU 16893/92 A AU16893/92 A AU 16893/92A AU 1689392 A AU1689392 A AU 1689392A AU 1689392 A AU1689392 A AU 1689392A
Authority
AU
Australia
Prior art keywords
sensor
encoder
mount assembly
detent lever
magnetic elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
AU16893/92A
Other versions
AU659151B2 (en
Inventor
Michael C. Brauer
Alfred J. Santos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Torrington Co Ltd
Original Assignee
Torrington Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Torrington Co filed Critical Torrington Co
Publication of AU1689392A publication Critical patent/AU1689392A/en
Application granted granted Critical
Publication of AU659151B2 publication Critical patent/AU659151B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/08—Range selector apparatus
    • F16H59/10—Range selector apparatus comprising levers
    • F16H59/105—Range selector apparatus comprising levers consisting of electrical switches or sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
    • G01D5/2497—Absolute encoders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20012—Multiple controlled elements
    • Y10T74/20018—Transmission control
    • Y10T74/20177—Particular element [e.g., shift fork, template, etc.]

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Description

DIGITAL POSITION SENSOR SYSTEM FOR AUTOMATIC TRANSMISSIONS
This invention relates generally to sensors to detect the position of a detente lever or manual valve in an automatic transmission. In particular, the present invention provides a sensor capable of detecting changes in magnetic fields and generating a digital electrical signal indicative of the transmission gear mode which has been selected by the vehicle operator.
BACKGROUND OF THE INVENTION
To engage an automatic transmission into a specific gear mode, i.e., park (P), reverse (R), neutral (N), drive (D or 4), and low drives (1, 2 and 3), a manual valve must be moved into proper position so that hydraulic pressure can be directed to appropriate transmission components. Likewise, a parking rod must be positioned for proper engagement when in (P). The manual valve and parking rod are linked to the transmission selector lever (located in the passenger compartment) via a detente lever, within the transmission case. Conventional mode switches, which are designed to provide an electrical signal based on the gear selected, are connected to this linkage and are located outside the transmission case.
With conventional mode switches, an electrical signal is generated by sliding contacts. As a linkage rotates, electrical contacts slide along a uniquely designed pad to produce electrical signals. Such electrical signals can be used in transmission control algorithms and with electronic gear selection displays. Some of the more prevalent problems with this type of external, mechanical switch are: (1) positional adjustment is required during installation; (2) poor accuracy results from the tolerance stack-up of the many components involved (i.e. , the output of the switch may indicate a gear mode that has not been selected); (3) sealing from the environment is required; and (4) the sliding contacts of these mechanical switches are prone to corrosion and wear, which results in poor electrical con- tact.
Magnetic field sensors have been proposed to replace conventional mode switches to indicate a selected gear of an automatic transmission. Such sensors would detect binary control signals generated when a code slide with a pattern or protuberances is moved across a magnetic field. However, these proposed magnetic field devices relate to sensors disposed outside the transmission housing and indicate the position of a shift lever, not the gear mode of the transmission itself. For those reasons, such devices solve few of the listed problems associated with external mechanical switches.
The foregoing illustrates limitations known to exist in present sensors to detect a selected gear of an automatic transmission. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing a sensor system for automatic transmissions for detecting gear modes. The sensor system is disposed about a detente lever internally within the transmission case. The sensor system includes an encoder means, disposed on or about a detente lever, capable of generating a magnetic field and at least one sensor disposed opposite the encoder means.
In a preferred embodiment of the present invention, the encoder means is a magnetic strip having a least one binary code track encoded thereon, and the sensor means is a Hall-effect or other magnetic field sensor juxtaposed with the encoded track such that it produces a digital signal representative of the position of the encoder means and the corresponding gear mode.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a simplified representation of a detente lever of an automatic transmission having a three-track binary code encoder disposed thereon according to one embodiment of the present invention;
Fig. 2 is a chart illustrating the output of sensors for each gear mode according to the embodiment of Fig 1;
Fig. 3 is a simplified representation of the detente lever together with a sensor means disposed thereupon according to the embodiment of Fig. 1;
Fig. 3A is a cross-sectional view along line A-A of Fig. 3;
Fig. 4 is a series of graphs depicting the waveforms generated by the track on the encoder of the embodiment of Fig. 1;
Fig. 5 is a simplified representation of another embodiment of the present invention, wherein the sensor mount assembly is connected to the detente lever shaft and a channel plate;
Fig. 5A is a simplified representation of the detente lever and encoder mount assembly of Fig. 5;
Fig. 5B is a cross-sectional view along line B-B of Fig. 5A together with portions of the sensor mount assembly of Fig. 5;
Fig. 6 is an exploded view of a third embodiment of the present invention, wherein a linear moving encoder and a sensor are disposed about a detente lever;
Fig. 7 is a more detailed representation of an embodiment of the present invention similar to that of Fig. 1, wherein a sensor housing is connected to a detente lever shaft and a detente lever spring roller within an automatic transmission;
Fig. 7A is a side view of the sensor system of Fig. 7; and
Fig. 7B is a cross-sectional view along line B-B of Fig. 7A.
DETAILED DESCRIPTION
Fig. 1 depicts a detente lever 11 of an automatic transmission having notches or detents corresponding to gear modes (1, 2, 3, 4, N, R, and P). The detente lever 11 is within the housing of the transmission and is typically a steel plate secured to a shaft rotated from outside the housing. Spring loaded engagement with the detents holds the transmission in gear. An extension (X) provides additional resistance to movement between reverse and park.
Fig. 3 depicts a preferred embodiment of the present invention, wherein three separate Hall-effect sensors 1,2,3, are disposed directly opposite a binary code encoder (e.g., magnetic poles) 4 having three separate binary code encoded tracks 5,6,7. Hall-effect sensors 1,2,3 and encoder 4 generate distinct outputs that correspond to detente positions on the detente lever and gear modes. Sensor mount assembly δ containing Hall-effect sensors 1,2,3 is held between a detente lever shaft 9 and a detente lever spring 1C. Encoder 4 is affixed to detente lever 11 and positioned directly underneath sensor mount assembly 8. As detente lever 11 rotates back and forth (e.g., when the operator is selecting a gear), encoder 4 switches individual Hall-effect sensors 1,2,3 on or off, generating a distinctive output corresponding to each gear mode.
It is important to maintain a specified air gap between Hall-effect sensors 1,2,3 and encoder 4. Fig. 3A shows that an encoder mount assembly 12 formed of a non-magnetic material (e.g., polyetherimide) and having one or more guides 13 and 14, may be moved with respect to sensor mount assembly 8. Encoder mount assembly 12 is designed to maintain a predetermined air gap between the Hall-effect sensors and the encoder, while permitting the encoder to move radially with respect to the sensor mount assembly as changes of gear modes occur. Fig. 3A also shows that tracks 5,6,7 are aligned directly underneath their corresponding Hall-effect sensors 3,2,1 to ensure proper detection of gear mode changes. Encoder mount assembly 12 is affixed to detente lever 11 by any mechanical means, e.g., snap or heat stake.
Figs. 2 and 4 depict binary code signals detected by the Hall-effect sensors as they traverse the three tracks of the encoder of Fig. 1. Encoder 4 has been magnetized with various North and South segments, i.e., North segments appear black and South segments appear white. Each gear mode (1234NRP) is designated by an individual magnetic segment from each of the tracks 5,6,7. For example, gear (1) is defined by a South segment in each of tracks 5,6,7, whereas gear (N) is defined by track 7 having a North segment, track 6 having a North segment and track 5 having a South segment. The North segments will turn the overlying Hall-effect sensor "on" (depicted as "1") and the South segments will turn it "off" (depicted as "0" ) .
The graph in Fig. 4 illustrates the output voltage of each sensor 1,2,3 as encoder 4 traverses those sensors. For example, track 7, which includes four South segments followed by four North segments, generates a voltage signal having a straight line followed by a pulse of equal length. Track 6, which includes two South segments, four North segments and two additional South segments, generates a voltage signal having a straight line followed by a pulse twice as long as the previous straight line which is followed by a short straight line. Track 5, which includes one South segment, two North segments, two South segments, two North segments and one South segment generates a voltage signal having a straight line, a pulse, a straight line, a pulse and a straight line.
The binary code signals depicted in Fig. 4 correspond directly to the outputs of Hall-effect sensors 1,2,3. These signals may repeat in such a manner that a sequential transition between two particular code words can occur in only one direction. For example, with reference to Fig. 2, the transition from the word Oil to the word 010 can only occur when the detente lever 11 is moved from gear mode 3 to gear mode 4. Conversely, the transition from the word 010 to the word Oil can only occur when the detente lever 11 is moved from gear mode 4 to gear mode 3. Accordingly, the control module will know the direction in which the sensor is moving because of the order in which the code words occur. Preferably, the binary code is of a type known as a Gray code, having only one of the three digits of each code word change from position to adjacent position.
Encoder 4 is shaped so that each gear mode will turn the three Hall-effect sensors on or off in the unique pattern illustrated in Fig. 2. As can be seen, a Gray code was chosen for this electrical output. When moving from one gear mode to another, one and only one Hall-effect sensor switches states. If zero, two or all three sensors switch states, then the vehicle's system computer would detect an error.
An alternate embodiment is shown in Figs. 5-5B, wherein sensor mount assembly 20 similar to sensor mount assembly 8 is affixed to detente lever shaft 21. The sensor mount assembly 20 snaps or screws onto channel plate 22 of the transmission instead of to a detente lever spring. Detente lever 23 and an encoder 27 rotate with respect to the sensor mount assembly 20.
As shown in Fig. 5C, sensor mount assembly 20 includes a guide or hook 24 that fits about a guide or lip 25 of an encoder mount assembly 26 in order to maintain a predetermined air gap between Hall-effect sensors and an encoder 27. Encoder mount assembly 26 is best shown in Fig. 5B, wherein encoder 27 is encapsulated in a polyetherimide housing 29 having guide 25 at one end thereof. Encoder mount assembly 26 has a radial configuration to permit it to rotate about the stationary sensor mount assembly such that the Hall-effect sensors can obtain an accurate reading of each binary code associated with gear mode changes. Encoder mount assembly 26 can be affixed to detente lever 23 by any means known to those skilled in the art.
Another embodiment according to the present invention is illustrated in Figs. 6-6A, wherein an encoded magnet or encoder 36 moves linearly, instead of radially, with respect to a sensor 37. In this design, an encoder housing 44 and a detente lever 40 are connected to gear shift spool 42 via an L—shaped rod 41 having a hook 47 and clip 48. Encoder housing 44 is slidingly mounted on a sensor mount assembly 45 by dovetails 35 or other means. The sensor mount assembly 45 is pivotally mounted at point 43 and includes a power source connector 46 and sensors 49. Encoder housing 44 has a channel 39 for guiding the rod 41 and is capable of linear movement with respect to the sensor mount assembly 45 to permit detection of the various gear modes. That is, when detente lever 40 is rotated to change gear modes by means of spool 42, encoder housing 44 is moved a corresponding linear distance with respect to sensor mount assembly 45. Guide pads 38 may be mounted on the encoder housing 44 or sensor mount assembly 45 to facilitate sliding with respect to the detente lever 40.
A full arc magnet is preferably encoded with a binary code having a pattern similar to that set forth in Fig. 1. Since it is highly desirable to make the encoder as compact as possible, the end code should be 000 and the outside corners should also be 0. The encoded tracks can also be compressed to efficiently satisfy the compact space requirements of the sensor system. The encoder can be encoded with a binary code by any means known to those skilled in the art, e.g., physical magnetic blocks, magnetic writing and shaped field magnetization techniques.
The encoder is shaped in such a manner that when the encoder moves with respect to the Hall-effect sensors, the Hall-effect sensors produce a digital code indicating the position of the encoder. The encoder shape should also be such that during radial applications the Hall-effect sensors line up with encoded track segments corresponding to a specific gear mode.
This may require alteration of segment sizes from one track to the next.
Another preferred embodiment of the present invention is set forth in Figs. 7-7B, wherein Fig. 7 shows a detente lever 50, a sensor mount assembly 51, and an encoder mount assembly 52 disposed within an automatic transmission 54. Encoder mount assembly 52 is affixed to detente lever 50 in such a manner that its encoded track segments directly correspond to gear modes of the transmission. One end of sensor mount assembly 51 is designed to snap over and pilot from detente lever shaft 55 and the other end has two fingers 56 and 57 that straddle a roller of detente lever spring 58. Since detente lever shaft 55 is stationary and detente lever spring 58 does not rotate about detente lever shaft 55, sensor mount assembly 51 remains stationary. This is required to provide proper accuracy of electrical outputs.
Fig. 7A illustrates how fingers 56 and 57 of sensor mount assembly 51 straddle roller 60 of detente lever spring 58. As detente lever 50 is moved by gear shift spool 59 during the changing of gear modes, detente lever spring 58 moves in and out from detente lever 50 as roller 60 traverses the perturbations of detente lever 50. The design of sensor mount assembly 51 is such that roller 60 can move linearly between fingers 56 and 57 while it traverses the perturbations of detente lever 50 without disturbing the stationary position of sensor mount assembly 51.
The cross-sectional view of Fig. 7B depicts a guide or hook on the bottom of sensor mount assembly 51 which engages with a guide or lip on encoder mount assembly 52. This guide prohibits sensor mount assembly 51 from lifting relative to detente lever 50, thereby providing a predetermined and constant air gap between the Hall-effect sensors and the encoder surface. This air gap control, along with roller 60 and detente lever shaft 55, allow the sensor mount assembly 51 to be held close to the encoder. Encoder mount assembly 52 is held stationary relative to the detente lever by snap fitting legs 62,64 through pre-punched holes in the detente lever, or any other conventional means of affixing it thereto. Encoder mount assembly 52 includes an encoder encapsulated within a nonconductive polyetherimide housing. Both the assembly and disassembly of this system are straightforward. The encoder mount assembly is snapped into place on the face of the detente lever, and the detente lever is then installed in its normal fashion. In the radial design, the sensor mount assembly is snapped over the detente lever shaft in the transmission. This is done by sliding the sensor mount assembly along the detente lever face between the park mechanism and the encoder mount assembly. The sensor mount assembly is rotated over the face of the encoder mount assembly, engaging the piloting lip or encoder guide means therebetween. To rotate the sensor mount assembly, the detente lever spring must be pulled back to allow the fingers of the sensor mount housing to clear the roller of the detente lever spring. This design permits rotation of the encoder mount assembly with respect to the sensor mount assembly and maintains a predetermined air gap between the sensor mount assembly.
Alternatively, the sensor mount assembly can be affixed between the detente lever shaft and the channel plate of the transmission to maintain its stationary position with respect to the encoder mount assembly.
In accordance with the linear design, a linear moving encoder is mechanically connected to the moving spool of the channel plate and the detente lever, such that the encoder is capable of moving only linearly with respect to the sensors as gear modes change.
The disassembly of the sensor system is as simple as its installation, even for a transmission located in a vehicle.
Once the transmission pan is removed, the sensor system is clearly visible. In the radial design, the detente lever spring may be pulled radially outward, permitting the sensor mount assembly to be rotated counter-clockwise until it contacts the park (P). The sensor mount assembly can then simply be snapped from the detente lever shaft and removed. If required, the encoder mount assembly can then be unsnapped from the detente lever.

Claims (12)

What is claimed is:
1. A sensor system for detecting gear modes of an automatic transmission, the automatic transmission having a detent lever located internal to a transmission case, the sensor system comprising: an encoder means fixed to the detent lever, the encoder means having multiple magnetic elements arranged in at least three parallel binary code tracks, the magnetic elements being arranged in a plurality of sets, each set consisting of one magnetic element from each binary code track, the magnetic elements in a set corresponding to a transmission gear mode, the polarity of the magnetic elements m a set uniquely identifying a transmission gear mode; and at least three sensor means disposed opposite the encoder means for detecting changes of the gear modes, each sensor means being a magnetic field sensor which produces a digital signal, the digital signals of the at least three sensor means being representative of the position of the encoder means thereby indicating the transmission gear modes, the digital signals of the at least three sensor means being unique for each transmission gear mode, the sensor means being mounted m a sensor mount assembly.
2. A sensor system for detecting gear modes of an automatic transmission, the automatic transmission having a detent lever located internal to a transmission case, the sensor system comprising: an encoder means fixed to the detent lever, the encoder means having multiple magnetic elements arranged m at least three parallel binary code tracks, the magnetic elements being arranged m a plurality of sets, each set consisting of one magnetic element from each binary code track, the magnetic elements m a set corresponding to a transmission gear mode, the of the magnetic elements in a set uniquely identifying a transmission gear mode; at least three sensor means disposed opposite the encoder means for detecting changes of the gear modes, each sensor means being a magnetic field sensor which produces a digital signal, the digital signals of the at least three sensor means being representative of the position of the encoder means thereby indicating the transmission gear modes, the digital signals of the at least three sensor means being unique for each transmission gear mode; a sensor mount assembly for mounting the sensor means, the sensor mount assembly being slidably interlocked with one of the encoder means or the detent lever, the sensor mount assembly including a guide means for piloting the sensor mount assembly such that a predetermined distance is maintained between the encoder means and the sensor means; and the encoder means moving radially with respect to the sensor means.
3. A sensor system for detecting gear modes of an automatic transmission, the automatic transmission having a detent lever located internal to a transmission case, the sensor system comprising: an encoder means attached to the detent lever, the encoder means having multiple magnetic elements arranged in at least three parallel binary code tracks, the magnetic elements being arranged in a plurality of sets, each set consisting of one magnetic element from each binary code track, the magnetic elements in a set corresponding to a transmission gear mode, the polarity of the magnetic elements in a set uniquely identifying a transmission gear mode; at least three sensor means disposed opposite the encoder means for detecting changes of the gear modes, each sensor means being a magnetic field sensor which produces a digital signal, the digital signals of the at least three sensor means being representative of the position of the encoder means thereby indicating the transmission gear modes, the digital signals of the at least three sensor means being unique for each transmission gear mode, the sensor means being mounted in a sensor mount assembly; and the encoder means and the sensor means moving linearly with respect to each other.
4. A sensor system for detecting gear modes of an automatic transmission, the automatic transmission having a detent lever located internal to a transmission case, the sensor system comprising: an encoder means fixed to the detent lever, the encoder means having multiple magnetic elements arranged in at least three parallel binary code tracks, the magnetic elements being arranged in a plurality of sets, each set consisting of one magnetic element from each binary code track, the magnetic elements in a set corresponding to a transmission gear mode, the polarity of the magnetic elements in a set uniquely identifying a transmission gear mode; at least three sensor means disposed opposite the encoder means for detecting changes of the gear modes, each sensor means being a magnetic field sensor which produces a digital signal, the digital signals of the at least three sensor means being representative of the position of the encoder means thereby indicating the transmission gear modes, the digital signals of the at least three sensor means being unique for each transmission gear mode; the encoder means and the sensor means moving linearly with respect to each other; the sensor means and the encoder means being slidably interlocked with each other; and the encoder means including a sensor guide means for piloting the sensor means such that a predetermined distance is maintained between the encoder means and the sensor means.
5. The sensor system according to claim 1, 3 or 4 wherein the sensor mount assembly includes a guide means for piloting the sensor mount assembly such that a predetermined distance is maintained between the encoder means and the sensor means.
6. The sensor system according to claim 1 wherein the sensor mount assembly is slidably interlocked with one of the encoder means or the detent lever.
7. The sensor system according to claim 1 or 2 wherein the detent lever has a shaft and the sensor mount assembly is connected to the shaft.
8. The sensor system according to claim 1 or 2 wherein the detent lever has a shaft and the sensor mount assembly is connected to the detent lever shaft and to a stationary part of the automatic transmission.
9. The sensor system according to claim 1 or 2 wherein the detent lever has a shaft and the detent lever is retained in a specific gear mode by a retention spring and the sensor mount assembly is connected to the shaft and slidingly connected to the retention spring.
10. The sensor system according to claim 3 wherein the sensor means and the encoder means are slidably interlocked with each other.
11. The sensor system according to claim 3 wherein the sensor mount assembly is pivotally mounted on the automatic transmission.
12. The sensor system according to claim 4 further comprising: an encoder mount assembly for mounting the encoder, the encoder mount assembly being connected to a gear shift spool linkage and the detent lever, the encoder mount assembly having a slot therein for permitting motion relative to the gear shift spool linkage.
AU16893/92A 1991-04-03 1992-04-01 Digital position system for automatic transmissions Ceased AU659151B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US680143 1984-12-10
US68014391A 1991-04-03 1991-04-03
PCT/US1992/002601 WO1992017719A1 (en) 1991-04-03 1992-04-01 Digital position sensor system for automatic transmissions

Publications (2)

Publication Number Publication Date
AU1689392A true AU1689392A (en) 1992-11-02
AU659151B2 AU659151B2 (en) 1995-05-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
AU16893/92A Ceased AU659151B2 (en) 1991-04-03 1992-04-01 Digital position system for automatic transmissions

Country Status (9)

Country Link
US (1) US5307013A (en)
JP (1) JPH06510836A (en)
CN (1) CN1065524A (en)
AR (1) AR246896A1 (en)
AU (1) AU659151B2 (en)
BR (1) BR9205826A (en)
DE (2) DE4290856C2 (en)
TW (1) TW248544B (en)
WO (1) WO1992017719A1 (en)

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DE4290856T1 (en) 1994-02-17
US5307013A (en) 1994-04-26

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